<template>
	<view class="uni-combox">
		<view v-if="label" class="uni-combox__label" :style="labelStyle">
			<text>{{label}}</text>
		</view>
		<view class="uni-combox__input-box">
			<input class="uni-combox__input" type="text" :placeholder="placeholder" :disabled="isDisabled" v-model="inputVal"
			 @input="onInput" @focus="onFocus" @blur="onBlur" />
			<icon type="clear" size="16" @tap="clearInputValue" v-if="!isDisabled" />
			<image class="uni-combox__input-arrow" src="../../static/icon/arrow_down.png" style="width: 30rpx;height: 30rpx;" @click="toggleSelector"></image>
			<!-- <uni-icons class="uni-combox__input-arrow" type="arrowdown" size="14" @click="toggleSelector"></uni-icons> -->
			<view class="uni-combox__selector" v-if="showSelector">
				<scroll-view scroll-y="true" class="uni-combox__selector-scroll">
					<view class="uni-combox__selector-empty" v-if="filterCandidatesLength === 0">
						<text>{{emptyTips}}</text>
					</view>
					<view class="uni-combox__selector-item" v-for="(item,index) in filterCandidates" :key="index" @click="onSelectorClick(index)"
					 :style="isCheck(index)?'color:'+selectColor+';background-color:'+selectBgColor+';':'color:'+color+';'">
						<text>{{isJSON?item[keyName]:item}}</text>
					</view>
				</scroll-view>
			</view>
		</view>
	</view>
</template>

<script>
	/**
	 * Combox 组合输入框
	 * @description 组合输入框一般用于既可以输入也可以选择的场景
	 * @property {String} label 左侧文字
	 * @property {String} labelWidth 左侧内容宽度
	 * @property {String} placeholder 输入框占位符
	 * @property {Array} candidates 候选项列表
	 * @property {String} emptyTips 筛选结果为空时显示的文字
	 * @property {String} value 单选时组合框的初始值
	 * @property {Array} initValue 多选时组合框的初始值(下标集合)
	 * @property {String} keyName json数组显示的字段值
	 * @property {Boolean} isJSON 是否是json数组，默认不是
	 * @property {Boolean} isDisabled 是否是禁用输入，默认不禁用
	 * @property {Boolean} isCheckBox 是否是多选，默认不是，多选时不能输入查询
	 * @property {String} color 默认字体颜色，默认#000000
	 * @property {String} selectColor 选中字体颜色，默认#0081ff
	 * @property {String} selectBgColor 选中背景颜色，默认#e8e8e8
	 */
	export default {
		name: 'comboxSearch',
		props: {
			label: {
				type: String,
				default: ''
			},
			labelWidth: {
				type: String,
				default: 'auto'
			},
			placeholder: {
				type: String,
				default: ''
			},
			candidates: {
				type: Array,
				default () {
					return []
				}
			},
			emptyTips: {
				type: String,
				default: '无匹配项'
			},
			value: {
				type: String,
				default: ''
			},
			initValue: {
				type: Array,
				default: null
			},
			keyName: {
				type: String,
				default: ''
			},
			isJSON: {
				type: Boolean,
				default: false
			},
			isDisabled: {
				type: Boolean,
				default: false
			},
			isCheckBox: {
				type: Boolean,
				default: false
			},
			color: {
				default: "#000000",
				type: String
			},
			selectColor: {
				default: "#0081ff",
				type: String
			},
			selectBgColor: {
				default: "#e8e8e8",
				type: String
			}
		},
		data() {
			return {
				showSelector: false,
				inputVal: '',
				arrays: [],
				gid: `sm-org-dropDown-${(new Date()).getTime()}${Math.random()}`
			}
		},
		computed: {
			labelStyle() {
				if (this.labelWidth === 'auto') {
					return {}
				}
				return {
					width: this.labelWidth
				}
			},
			filterCandidates() {
				if (!this.isDisabled) {
					if (this.isJSON) {
						let index = 0;
						return this.candidates.filter((item) => {
							item.index = index;
							index++;
							return item[this.keyName].indexOf(this.inputVal) > -1
						})
					} else {
						return this.candidates.filter((item) => {
							return item.indexOf(this.inputVal) > -1
						})
					}
				} else {
					if (this.isJSON) {
						let index = 0;
						return this.candidates.filter((item) => {
							item.index = index;
							index++;
							return item[this.keyName] != undefined;
						})
					} else {
						return this.candidates
					}
				}
			},
			filterCandidatesLength() {
				return this.filterCandidates.length
			}
		},
		created() {
			if (this.initValue != null) {
				this.arrays = this.initValue;
				this.inputVal = this.getInpuevals();
			}
			//在created的时候，给子组件放置一个监听，这个时候只是监听器被建立，此时这段代码不会生效
			//uni.$on接收一个sm-org-dropDown-show的广播
			uni.$on('sm-org-dropDown-show', (targetId) => {
				//接收广播，当该组件处于下拉框被打开的状态，并且跟下一个被点击的下拉框的gid不同时，将该组件的下拉框关闭，产生一个互斥效果。
				if (this.showSelector && this.gid != targetId) {
					this.showSelector = false
				}
			})
		},
		//当子组件销毁的时候，将建立的监听销毁，这里不会影响代码效果，但是在多次反复引用组件时，会在根节点定义越来越多的监听，长此以往影响性能，所以在不用的时候及时销毁，养成好习惯
		beforeDestroy() {
			uni.$off('sm-org-dropDown-show')
		},
		watch: {
			value: {
				handler(newVal) {
					this.inputVal = newVal
				},
				immediate: true
			}
		},
		methods: {
			toggleSelector() {
				this.showSelector = !this.showSelector
				if (this.showSelector) {
					uni.$emit('sm-org-dropDown-show', this.gid)
				}
			},
			onFocus() {
				this.showSelector = true;
				uni.$emit('sm-org-dropDown-show', this.gid)
			},
			onBlur() {
				/* setTimeout(() => {
					this.showSelector = false;
				}, 50) */
			},
			onSelectorClick(index) {
				if (this.isCheckBox) {
					let flag = this.arrays.indexOf(index);
					if (flag != -1) {
						let x = (this.arrays || []).findIndex((item) => item === index)
						this.arrays.splice(x, 1);
					} else {
						this.arrays.push(index);
					}
					this.inputVal = this.getInpuevals();
					if (this.isJSON) {
						this.$emit('getValue', this.arrays);
					} else {
						this.$emit('getValue', this.trimSpace(this.inputVal.split(" ")));
					}
				} else {
					this.showSelector = false
					if (this.isJSON) {
						this.$emit('getValue', this.filterCandidates[index].index);
						this.inputVal = this.filterCandidates[index][this.keyName];
					} else {
						this.$emit('getValue', this.filterCandidates[index]);
						this.inputVal = this.filterCandidates[index]
					}
				}
			},
			trimSpace(array) {
				for (var i = 0; i < array.length; i++) {
					if (array[i] == "") {
						array.splice(i, 1);
						i = i - 1;
					}
				}
				return array;
			},
			onInput() {
				setTimeout(() => {
					this.$emit('input', this.inputVal)
				})
			},
			clearInputValue() {
				this.inputVal = "";
				this.showSelector = false;
			},
			getInpuevals() {
				if (this.arrays.length == 0) {
					this.inputVal = "";
				} else {
					this.arrays.sort(function(a, b) {
						return a - b
					})
					this.inputVal = "";
					if (this.isJSON) {
						this.arrays.forEach(v => {
							this.inputVal += this.candidates[v][this.keyName] + " ";
						});
					} else {
						this.arrays.forEach(v => {
							this.inputVal += this.candidates[v] + " ";
						});
					}
				}
				return this.inputVal;
			},
			isCheck(index) {
				return this.arrays.indexOf(index) != -1;
			}
		}
	}
</script>

<style scoped>
	.uni-combox {
		/* #ifndef APP-NVUE */
		display: flex;
		/* #endif */
		height: 40px;
		flex-direction: row;
		align-items: center;
		/* border-bottom: solid 1px #DDDDDD; */
	}

	.uni-combox__label {
		font-size: 16px;
		line-height: 22px;
		padding-right: 10px;
		color: #999999;
	}

	.uni-combox__input-box {
		position: relative;
		/* #ifndef APP-NVUE */
		display: flex;
		/* #endif */
		flex: 1;
		flex-direction: row;
		align-items: center;
	}

	.uni-combox__input {
		flex: 1;
		font-size: 16px;
		height: 22px;
		line-height: 22px;
		color: gray;
	}

	.uni-combox__input-arrow {
		padding: 10px;
	}

	.uni-combox__selector {
		box-sizing: border-box;
		position: absolute;
		top: 42px;
		left: 0;
		width: 100%;
		background-color: #FFFFFF;
		border-radius: 6px;
		box-shadow: #DDDDDD 4px 4px 8px, #DDDDDD -4px -4px 8px;
		z-index: 2;
	}

	.uni-combox__selector-scroll {
		max-height: 200px;
		box-sizing: border-box;
	}

	.uni-combox__selector::before {
		content: '';
		position: absolute;
		width: 0;
		height: 0;
		border-bottom: solid 6px #FFFFFF;
		border-right: solid 6px transparent;
		border-left: solid 6px transparent;
		left: 50%;
		top: -6px;
		margin-left: -6px;
	}

	.uni-combox__selector-empty,
	.uni-combox__selector-item {
		/* #ifdef APP-NVUE */
		display: flex;
		/* #endif */
		line-height: 36px;
		font-size: 14px;
		text-align: center;
		border-bottom: solid 1px #DDDDDD;
		/* margin: 0px 10px; */
	}

	.uni-combox__selector-empty:last-child,
	.uni-combox__selector-item:last-child {
		border-bottom: none;
	}
</style>
